Three new digenetic trematodes, Emoleptalea pioteropora, n. sp. (Cephalogonimidae: Cephalogoniminae), Phyllodistomum symmetrorchis, n. sp., and Phyllodistomum ghanense, n. sp. (Gorgoderidae: Gorgoderinae) from West African freshwater fishes. Proceedings of the Helminthological Society of Washington, 25 1958: 1-8. [Zoological Record Volume 95]